Hi, thank you for contacting JustAnswer.com. My name is Russell. I will do my best to provide the right answer to your question.
After detailed examination, I find that the two models you ask about are very close to being equipped with the same capabilities.
The screen is the same size. Both have Sirius capability (note: it is Expandability, requiring an add-on Sirius/XM tuner!), Apple CarPlay, Android Auto; they can both play DVDs and have a DVD drive; both have SD card reader; both ... etc. etc., pretty much.
But: one is sold, in the instance I have seen, *with* a remote control, and the other without it. And the one sold (in the instance I examined closely, which might be exceptional) without a remote, is the F70. If you can get a deal where a remote is included, of course, that one big difference is not siginificant.
I'd say either one is about an equal choice.